The usual way to ensure reliable delivery is to provide the(11)with some feedback about what is happening at the other end of th

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问题 The usual way to ensure reliable delivery is to provide the(11)with some feedback about what is happening at the other end of the line．Typically，the protocol calls for the receiver to send back special (12)flame bearing positive or negative (13)about the incoming flames．If the sender receives a positive．Acknowledgement about a flame，it knows the flame has arrived safely．On the other hand，a negative acknowledgement means that something has gone wrong，and the frame must be transmitted again．An additional complication comes from the possibility that hardware troubles may cause a flame to(14)completely．In this case，the receiver will not react at all，since it has no any reason to react．It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement，positive or negative，will hang forever if a flame is ever lost due to，for example，(15)handware．(2008年下半年试题)
(11)

选项 A、receiver
B、controiler
C、sender
D、customer

答案C

解析

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本试题收录于：网络工程师上午基础知识考试题库软考中级分类

网络工程师上午基础知识考试

软考中级

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